Builder: https://uberchromegw.corp.google.com/i/chromium.perf/builders/Mac%20HDD%20Perf%20%285%29?numbuilds=50
Tests: blink_style.top_25, page_cycler_v2.intl_hi_ru, v8.top_25_smooth

Looks like a bot misconfiguration; several log lines like

(INFO) 2016-08-26 22:03:03,225 browser.DumpStateUponFailure:346  *************** BROWSER STANDARD OUTPUT ***************
(INFO) 2016-08-26 22:03:03,226 browser.DumpStateUponFailure:348  2016-08-26 21:55:31.487 Google Chrome[5639:24960] NSWindow warning: adding an unknown subview: <FullSizeContentView: 0x7ffb78693ed0>
2016-08-26 21:55:31.488 Google Chrome[5639:24960] Call stack:
(
    "+callStackSymbols disabled for performance reasons"
)
<<<< VTVideoEncoderSelection >>>> VTSelectAndCreateVideoEncoderInstanceInternal: no video encoder found for 'avc1'

[04:55:32.023] VTSelectAndCreateVideoEncoderInstanceInternal signalled err=-12908 (err) (Video encoder not available) at /SourceCache/CoreMedia_frameworks/CoreMedia-1562.240/Sources/VideoToolbox/VTVideoEncoderSelection.c line 1245
[04:55:32.023] VTCompressionSessionCreate signalled err=-12908 (err) (Could not select and open encoder instance) at /SourceCache/CoreMedia_frameworks/CoreMedia-1562.240/Sources/VideoToolbox/VTCompressionSession.c line 946


It's also failing v8.top_25_smooth.reference and blink_style.top_25.reference, although with different errors.